linux-kernel - Re: [PATCH] cpupower: fix lib default installation path

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Date: Sat, 29 Jun 2024 14:20:11 +0200
From: Roman Storozhenko <romeusmeister@...il.com>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: Thomas Renninger <trenn@...e.com>, Shuah Khan <shuah@...nel.org>, 
	Javier Carrasco <javier.carrasco.cruz@...il.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpupower: fix lib default installation path

On Fri, Jun 28, 2024 at 10:44 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> On 6/23/24 07:10, Roman Storozhenko wrote:
> > Invocation the tool built with the default settings fails:
> > $ cpupower
> > cpupower: error while loading shared libraries: libcpupower.so.1: cannot
> > open shared object file: No such file or directory> The issue is that Makefile puts the library to "/usr/lib64" dir for a 64
> > bit machine. This is wrong. According to the "File hierarchy standard
> > specification:
> > https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard
> > https://refspecs.linuxfoundation.org/FHS_3.0/fhs-3.0.pdf
> >
> > "/usr/lib<qual>" dirs are intended for alternative-format libraries
> > (e.g., "/usr/lib32" for 32-bit libraries on a 64-bit machine (optional)).
> >
> > The utility is built for the current machine and doesn't change bit
> > depth.
> > Fix the issue by changing library destination dir to "/usr/lib".
> >
> > Signed-off-by: Roman Storozhenko <romeusmeister@...il.com>
> > ---
> >   tools/power/cpupower/Makefile | 10 +---------
> >   1 file changed, 1 insertion(+), 9 deletions(-)
> >
> > diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
> > index cd0225a312b4..6c02f401069e 100644
> > --- a/tools/power/cpupower/Makefile
> > +++ b/tools/power/cpupower/Makefile
> > @@ -67,6 +67,7 @@ LANGUAGES =                         de fr it cs pt ka
> >   bindir ?=   /usr/bin
> >   sbindir ?=  /usr/sbin
> >   mandir ?=   /usr/man
> > +libdir ?=    /usr/lib
> >   includedir ?=       /usr/include
> >   localedir ?=        /usr/share/locale
> >   docdir ?=       /usr/share/doc/packages/cpupower
> > @@ -94,15 +95,6 @@ RANLIB = $(CROSS)ranlib
> >   HOSTCC = gcc
> >   MKDIR = mkdir
>
> These are set when make invoked from the kernel main
> Makefile - see "make tools" option in main Makefile
> >
> > -# 64bit library detection
> > -include ../../scripts/Makefile.arch
>
> This does the 64-librray detection based on arch.
> > -
> > -ifeq ($(IS_64_BIT), 1)
> > -libdir ?=    /usr/lib64
> > -else
> > -libdir ?=    /usr/lib
> > -endif
> > -
> >   # Now we set up the build system
> >   #
> >
> >
> > ---
> > base-commit: f76698bd9a8ca01d3581236082d786e9a6b72bb7
> > change-id: 20240623-fix-lib-install-3b7dccdbdf45
> >
> > Best regards,
>
> What happens if you cross-compile with this patch? Take a look at this
> commit that fixed cross-compile:
>
> a73f6e2fbe8077811ea9546e0d44a7533111f0ba
>
> This makefile has to be in sync with the rest of the tools - see
> "make tools" in the kernel main Makefile.

I have done this using "make tools" method mainline kernel and the
patch for x86_64 and risc-v:
1) x86_64
$make cpupower
$ sudo make cpupower_install -j8
$ cpupower
cpupower: error while loading shared libraries: libcpupower.so.1:
cannot open shared object file: No such file or directory

Works with my patch, and doesn't work with the mainline.

2) RISC-V:
$ make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- cpupower -j8
$ sudo make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- cpupower_install -j8
$ cpupower
cpupower: error while loading shared libraries: libcpupower.so.1:
cannot open shared object file: No such file or directory

Works with my patch, and doesn't work with the mainline.

By the way - the cpupower makefile handles neither 'CROSS_COMPILE' nor
'ARCH' variables.
So the result is always the same - binary for x86_64 architecture.

Let me try to rephrase what I wrote in the initial patch message:
The current lib target dir is based on architecture bit width, and
this  is wrong.
The library should be put in the '/usr/lib' dir regardless of whether
it is x86_32 or x86_64 .
This is the case for all the distros that comply with the 'File
Hierarchy Standard 3.0"
by Linux Foundation. Most of the distros comply with it.
You can check this by examining the "/usr/lb64" dir on debian-based
distros and find
that it contains only "/usr/lib64/ld-linux-x86-64.so.2"
And examine that "/usr/lib" contains both 32 and 64 bit code:
find /usr/lib -name "*.so*" -type f | xargs file | grep 32-bit
find /usr/lib -name "*.so*" -type f | xargs file | grep 64-bit

>
> thanks,
> -- Shuah
>
>


-- 
Kind regards,
Roman Storozhenko